Assertion (A) Na+and Al3+ are isoelectronic.Reason (R) Na belongs to s-block, while Al belongs to p-block.

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Both A and R are correct; R is the correct explanation of A.

Both A and R are correct; and R is not the correct explanation of A.

A is correct; R is incorrect.

R is correct; A is incorrect

answer is B.

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Detailed Solution

Na+and Al3+ are isoelectronic species because they have l0 electrons eachNa+=1s2,2s2,2p6=10e-Al3+=1s2,2s2,2p6=10e-

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